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A simulation test bench and test method for pulverized coal plugging a coalbed methane horizontal shaft

A technology for simulating test benches and horizontal wellbore, which is applied in earthwork drilling, wellbore/well components, production fluid, etc., and can solve problems such as inability to visually observe wellbore clogging

Active Publication Date: 2022-05-06
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problem of being unable to visually observe wellbore clogging, the present invention discloses a simulation test bench and test method for pulverized coal clogged coalbed methane horizontal wellbore, which provides scientific and effective information for the mechanism of coal pulverized coal clogged horizontal wellbore section in the drainage process. research methods

Method used

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  • A simulation test bench and test method for pulverized coal plugging a coalbed methane horizontal shaft
  • A simulation test bench and test method for pulverized coal plugging a coalbed methane horizontal shaft

Examples

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Embodiment 1

[0036] Such as figure 1 As shown, a simulation test bench for pulverized coal plugging a coalbed methane horizontal wellbore includes a simulated horizontal wellbore 9 for simulating a horizontal section wellbore 3 during coalbed methane exploitation, a liquid storage tank 14 for mixing coal slurry and methane, and the above simulated horizontal wellbore The left end of 9 is connected with the liquid outlet pipe 5, and the right end is connected with one end of the liquid inlet pipe 12, and the other end of the liquid inlet pipe 12 is connected with the liquid outlet of the liquid storage tank 14, and the liquid inlet pipe 12 connects the liquid storage tank 14 Connected with the simulated horizontal wellbore 9, the liquid inlet of the liquid storage tank 14 is connected with the gas outlet of the gas injection pump 20 through a high-pressure pipeline, and the gas inlet of the gas injection pump 20 is connected with the methane gas cylinder 21, and the methane in the methane ga...

Embodiment 2

[0042] The present invention also discloses a method for simulating a coal-bed methane horizontal wellbore plugged by coal dust, using the simulating test bench disclosed in Example 1, specifically comprising the following steps:

[0043] Step 1. Monitoring bottomhole pressure and temperature

[0044] First, the coalbed methane wellbore 3 is arranged, and before the hydraulic fracturing, the temperature and pressure sensor 2 is sent into the bottom of the well along the vertical well section of the wellbore 3 through the cable 1, and the hydraulic fracturing of the coal seam is started, and the temperature and pressure sensor 2 is started to monitor the bottom of the well The pressure and temperature parameters of the segment, and the monitored temperature and pressure data are transmitted to the data acquisition instrument 4 on the ground through the cable 1.

[0045] Step 2. Draw the parameter change curve and compile the control program

[0046] Import the temperature and ...

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Abstract

The invention discloses a simulation test bench and a test method for a coal bed gas horizontal well shaft blocked by coal powder, and relates to the technical field of coal bed gas mining. For the liquid storage tank of methane, the left end of the simulated horizontal shaft is connected to the liquid outlet pipe, the right end is connected to one end of the liquid inlet pipe, and the other end of the liquid inlet pipe is connected to the liquid outlet of the liquid storage tank. The liquid port is connected with the gas outlet of the gas injection pump through a high-pressure pipeline. The beneficial effect of the present invention is that, based on the bottom-hole pressure and temperature data observed on site, the actual characteristics of wellbore clogging can be truly reflected, and the characteristics of pulverized coal migration and clogging in the simulated horizontal wellbore can be visually observed, and the level of pulverized coal clogging can be analyzed. Wellbore conditions.

Description

technical field [0001] The invention relates to the technical field of coal-bed methane exploitation, in particular to a simulation test bench and a test method for pulverized coal plugging a coal-bed methane horizontal shaft. Background technique [0002] At present, the production of coalbed methane usually adopts the method of surface well drainage. By vertically arranging the wellbore on the ground into the coal seam, under the action of reservoir pressure, the coalbed methane desorbs, diffuses, and finally seeps and collects in the wellbore. The design method of horizontal well mining enables the coalbed methane well to have a larger contact area with the coal seam, which significantly increases the single well production of coalbed methane. [0003] As a low-permeability reservoir, coal reservoirs have poor natural seepage capacity of internal gas, and hydraulic fracturing is usually required to increase production. After the completion of wellbore layout and hydrauli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B43/26
CPCE21B43/006E21B43/26
Inventor 黄启铭程卫民王刚孙路路刘义鑫
Owner SHANDONG UNIV OF SCI & TECH